-89.63% is the change from 839 to 87
Calculation steps:
[( 87 - 839 ) ÷ 839] x 100 = -89.63%
Formula
Percentage change = [(87 - 839) / 839] x 100
Subtract the new number by the original number
87 - 839 = -752
-752 ÷ 839 = -0.8963051251489869
-0.8963051251489869 x 100 = -89.63%